I am trying to replace the shower valve cartridge for my single handle shower faucet. The plastic lip of the valve cartridge is broken . . . unless I turn my handle just right, my shower will leak! My problem in replacing the cartridge is that I don't know who the manufacturer is of my single handle shower faucet. Because I couldn't find a replacement, I actually glued the broken plastic piece back, but that only worked for about a month. Does anyone have any suggestions for tracking down replacement cartridges? The only identifying information on my faucet is "UPC" and "CSA", which I suspect is not unique to this manufacturer. Attached are some pictures . . .